Origen Against Celsus Book VIII

For "no one will be crowned," unless here upon earth, with this body of humiliation, "he strive lawfully."[114]

Constitutions of the Holy Apostles Book II

For those who conquer and those who are conquered are in the same place of running, but only those who have bravely undergone the race are where the garland is bestowed; and "no one is crowned, unless he strive lawfully."[76]

The First Epistle of Clement Concerning Virginity

this contest and "strive,"[35]

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Old Testament